The Crawford family from Numbaa, NSW, brought nine animals to show at International Dairy Week and walked away with two grand champion awards.
The family backed up Tuesday's win in the Guernsey show by taking the Holstein grand championship on Thursday.
The champion cow Fairvale Goldchip Melody 770 won the four-year-old class before fending off the older cows to take the senior champion award and then the grand champion award.
The win was another championship for the famous Fairvale prefix - which has been one of the most successful at International Dairy Week, now producing six champions for four different exhibitors.
The Crawfords picked up Fairvale Goldchip Melody 770 at the Fairvale Holsteins dispersal sale 15 months ago.
"She looked like a good show cow at the time, there was a lot of potential there," Andrew Crawford said.
The cow calved a few months ago and was "looking pretty good, so here we are", he said.
Andrew and his wife Abbey took over the herd from his parents in July 2018.
The herd comprises 950 cows, of which 10 were Guernseys and the balance Holsteins.
"We brought eight Holsteins and one Guernsey cow to show and got two champions," he said.
"We ... have champion Holstein and champion Guernsey in the supreme, so it's a bit exciting."
Judge Adam Liddle, from New York state, United States, said Fairvale Goldchip Melody 770 was just a beautiful cow.
"(She has) a beautiful mammary system, quality, that combination of dairyness and strength," he said.
Check out our gallery of the action from the Holstein judging
The intermediate champion cow Bluechip MH Hero Marion had to overcome illness and a subsequent operation to be ready for the show.
The three-year-old cow is owned by Californians Frank and Diane Borba and Australians Declan Patten and Brad Salmon.
Mr Patten said he had been fond of the cow since he saw it as a young heifer a couple of years ago at the Victorian Winter Fair.
"She was one of the best heifers I thought I'd seen in this country," he said.
"So I have been a big supporter and follower of her for a long time."
Mr Declan took the opportunity to buy into a partnership with the Borbas in the cow about six weeks ago.
"It hasn't been smooth sailing - the cow got a little sick and we had to operate but she has taken it like a champion," he said.
"The cow has ... recovered extremely well, she's a fighter and the personality of the cow is just amazing."
Mr Patten praised the efforts of the cow's breeders Dean and Di Malcolm, who prepared it for the show.
"(They) have just done an unbelievable job in preparation," he said.
"They are world-class cattle people and we were very confident in their abilities."
Mr Patten said the owners planned to bring the cow back to IDW next year.
"We think she's a cow with a big future," he said.
Mr Liddle said Bluechip MH Hero Marion was a long cow with more rib structure all the way through the length.
He said he liked its feet and legs, dairyness and beautiful mammary system.
The junior champion Murribrook Solomon Tambourine was shown Murribrook Holsteins, Moss Vale, NSW.
Stud principal Murray Sowter said he first showed the 18-month-old calf, a Solomon from a Goldwyn, at the Sydney Royal Show in April, where it won its class and was honourable mention.
it also went on to win its class at the NSW Nowra Holstein Spring Fair in August.
"Today she's won her class and is junior champion this time," he said.
Mr Sowter said the heifer ticked a lot of boxes.
"I guess we want heifers that could all come out like her," he said.
"She's framey, she's dairy, she's technically very correct, and really feminine for her size."
Mr Liddle said the heifer had the "openness and width throughout and the length you like to see".
HOLSTEIN HONOUR ROLL
Grand champion: Fairvale Goldchip Melody 770, Crawford Family, Numbaa, NSW.
Senior champion: Fairvale Goldchip Melody 770.
Reserve: Paringa Braxton Parry, Elm Banks Holsteins & A&S Barron, Crossley, Vic.
Best udder: Fairvale Goldchip Melody 770.
Intermediate champion: Bluechip MH Hero Marion, F&D Borba, D Patten & B Salmon, California, US.
Reserve: Elmar Solomon Jessica 2-ET, Elmar Holsteins, Leitchville, Vic.
Intermediate best udder:Horizon Bradnick Ambrosia 2-ET, Elm Banks Holsteins, Crossley, Vic.
Junior champion: Murribrook Solomon Tambourine-ET, Murribrook Holsteins, Moss Vale, NSW.
Reserve: Mario Park Walnutlawn Midas MD & JE Polson, Oxley Island, NSW.
RED-AND-WHITE HOLSTEIN HONOUR ROLL
Grand champion: Mitch Chipper Beauty-IMP-ET-RED, Mitch Holsteins & TPM, Bamawm, Vic.
Senior champion: Mitch Chipper Beauty-IMP-ET-RED.
Reserve: Murribrook Starlet Picolo IMP ET RED, MJ Sowter, Moss Vale, NSW.
Best udder: Mitch Chipper Beauty-IMP-ET-RED.
Intermediate champion: Whitegold Absolute Satin-ET-RED.
Reserve: Bluechip EV Shesaawesome Apple, Cherrylock Cattle Co. & H Bevan, Tallygaroopna, Vic.
Intermediate best udder:Whitegold Absolute Satin-ET-RED, M & A Rood, Morans Crossing, NSW.
Junior champion: Eclipse BC Red August ET RED, Eclipse Genetics & BlueChip Genitics, Zeerust, Vic.
Reserve: Eclipse Avalanche Delight-RED Robsvue Holsteins, Myponga, SA.
Catch our videos of all the action from the Holstein judging.